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Hello. I got this fourwheeler to fix for my buddy. It wasnt starting at all when I got it so I opened the valve cover up and checked the timing and the timing was way off. I set the timing bolted all back together and it started. It only stays running with very little throttle applied. There is a weird noise coming from the engine and it smells like its burning and also smokes from the headers. I posted a video idk how helpful it will be but I need some advice on the next step. I want to say it's the piston and rings, but I'm not too sure was also thinking something was up with the valves. Thought I would get some advice before trying anything. Thanks!

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2017-2019 sportsman 450/570 with eps factory service manual
This is the factory service manual for the 2017-2019 factory service manual for the sportsman 450/570 with electronic power steering